Method of forming golf balls from surface-roughened molds
View Patent ↗A method of forming a golf ball including the steps of forming a mold cavity; roughening the surface of the mold cavity to an average roughness of about 10 to about 200 microinches; and forming a golf ball component in the roughened cavity.
1. A method of forming a golf ball comprising:
forming a non-coated mold cavity;
providing within the mold cavity a vent pin and a vent surrounding the vent pin;
roughening the surface of the mold cavity to an average roughness of about 10 to about 200 microinches to form peaks and valleys wherein the valleys form a pattern of interconnected passageways in fluid communications with the vent pin wherein the roughness is sufficiently large enough to create adequate passageways to accommodate an air flow, yet small enough and shaped appropriately so that a cover material cannot enter the passageways sufficiently to prevent gases from traveling on a short path from a flow terminus to the vent surrounding the vent pin; and
removing any abrasive agent or removed mold material from the roughened surface of the mold cavity;
forming a golf ball component in the roughened non-coated cavity.
2. The method of claim 1 , wherein the step of roughening the surface further includes increasing an average roughness of the surface to between about 25 and about 100 microinches.
3. The method of claim 2 , wherein the step of roughening the surface further includes increasing an average roughness of the surface to between about 35 and about 50 microinches.
4. The method of claim 3 , wherein the cavity is roughened electrically, mechanically, or chemically.
5. The method of claim 1 , wherein the cavity is roughened by sand blasting.
6. The method of claim 1 , wherein the cavity is roughened by chemical etching.
7. The method of claim 1 , wherein the roughening includes directing an abrasive agent into contact with the surface.
8. The method of claim 7 , wherein the abrasive agent is carried by a gas into contact with the surface.
9. The method of claim 7 , wherein the abrasive agent is carried by a liquid into contact with the surface.
10. The method of claim 7 , wherein the abrasive agent has a grit size between about 10 and about 200 μm.
11. The method of claim 10 , wherein the abrasive agent has a grit size between about 75 and about 200 μm.
12. The method of claim 11 , wherein the abrasive agent has a grit size between about 90 and about 100 μm.
13. The method of claim 7 , wherein the abrasive agent comprises metal, metal alloys, minerals, sand, or ceramic.
14. The method of claim 13 , wherein the abrasive agent comprises silicon carbide, tungsten carbide, granite, boron carbide, or aluminum oxide.
15. The method of claim 7 , wherein the abrasive agent is directed at the surface at a pressure of between about 80 and about 120 psi for a time sufficient to roughen the surface.
16. The method of claim 15 , wherein the abrasive agent is directed at the surface for a time of between about 20 and about 60 seconds.
17. The method of claim 1 , wherein the golf ball component is injection molded.
18. The method of claim 1 , wherein the golf ball component is a cover layer.
19. The method of claim 18 , wherein the golf ball component is an outer cover layer.